#include<stdio.h>

int fun(int x)
{int y=0;

    if(x<1)
        {y=x;}
    else if(x>=1 && x<=10)
        {y=2*x-1;}
    else if(x>10 && x<=100)
        {y=3*x-11;}
    else
        {y=x*x-24;}

        return (y);
}

   int main()
  {
      int x;
      scanf("%d",&x);
      printf("The result is:y=%d\n",fun(x));
      return 0;
  }
